Lennox MLDVT-30NM Installation Instructions Manual page 31

Burner Air Shutter Adjustment Procedure
WARNING: Ensure front glass panel are in place and
sealed during adjustment.
CAUTION: Carbon will be produced if the air shutter is
closed too much. Any damage due to carboning result-
ing from improperly setting the air shutter is not covered
under the warranty.
CAUTION: The air shutter door and nearby appliance
surfaces are hot. Exercise caution to avoid injury while
adjusting flame appearance.
. Locate adjustment rod and adjust air shutter to the standard set-
ting as shown in Figure 49 (adjustment rod is located in the lower
control compartment).
Note: Move the adjustment rod down to decrease air and up to
increase.
2. Light appliance (follow lighting procedure on lighting label in con-
trol compartment or see the Care and Operation manual).
3. Allow the burner to operate for at least 15 minutes while observing
the flame continuously to ensure that the proper flame appearance has
been achieved (see Figuress47 and 48 ). If the following conditions
are present, adjust accordingly.
• If flame appears weak or sooty, adjust the air shutter, incremen-
tally, to a more open position until the proper flame appearance is
achieved.
• If flame stays lowered blue, adjust the air shutter, incrementally, to a
more closed position until the proper flame appearance is achieved.
4. Leave the control knob (off/pilot/on) in the ON position and the
burner OFF/ON switch OFF (and remote switches, if applicable).
5. When satisfied that the burner flame appearance is normal, re-
install the lower control compartment door then proceed to finish the
installation.
Figure 47
- Burner Flame Appearance Model MLDVT-30 & MLDVT-35
Figure 48
Figure 49
WARNING: Air shutter adjustment should only be per-
formed by a qualified professional service technician.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
- Burner Flame Appearance Model MLDVT-40 & MLDVT-45
Adjustment Set-Screw
Burner
Tube
Air Shutter
Adjustment Rod Down (fully Ref. Air shutter Patent:
open air opening position) U.S. Pat. 5,553,603
Main Burner Factory Air Shutter
Opening Setting - Inches (millimeter)
Model Nat.Gas
MLDVT-30 /32 (0.794)
MLDVT-35 /32 (0.794)
MLDVT-40 /32 (0.794)
MLDVT-45 /32 (0.794)
- Burner Air Shutter Adjustment
Adjustment
Rod Up
(closed min.
position)
Propane Gas
/8 (3.75)
/8" (3.2)
/4" (6.4)
3/6" (4.8)
3